Airspan AS4000, Installation Manual

Page: 111 / 193

Setup and Test
107
AS4000 CT Setup and Test
Turn-Up and DC measurements
Before commencing the turn-up of the rack, check that the serial number and Rev levels
of all cards have been entered into the test form.
Disconnect the Antenna.
Rack Turn-Up and Measuring Input Voltage (Test 1a)
This section describes the procedure for measuring and connecting DC to the rack,
checking that the cards have the correct alarm indications on power-up and measuring the
PSU output voltages.
Using the DMM measure and record the Exchange DC voltage supply across the input
terminals ( 1(+) & 2 (-).for Supply 1 and 3(+) & 4 (-).for supply 2). Check that the polarity is
correct and ensure that the voltage measured complies with the site nominal voltage and
is within the limits specified on the test results sheet.
Switching on the racks. (Test 1b)
CT Rack: Combiner Shelf
Place one PSU in the shelf. Switch the CT Combiner Rack ON by placing one breaker on.
The two breakers duplicate power to each shelf and the shelves will still function if one
power supply fails though the LED indicators on the power supplies will not be on. The
PSU should show a amber LED and the fail LED. Switch on the second breaker and the
Red LED should extinguish.
Switch off and place the second PSU in the shelf and repeat the process described in
paragraph 1.
Using the DMM check that the DC voltage supply across the input terminals (1+ & 1- for
Supply 1 and 2 + & 2- for supply 2) is still within the specified limits and record on the test
results sheet.
Measure the DC voltage at the front panel test points on each of the PSUs on the RF
Combiner Shelf. Ensure that the voltage measured is +13.5V DC +/- 500mV. Switch both
breakers off. Record the result.
Place a PA into the shelf to provide a load. Switch both breakers on and measure and
record the DC voltage at the o/p of each PSU.
Using the DMM, measure a the DC voltage at the front panel test points on each of the
PSUs on the RF Combiner Shelf. (Figure 35)
Ensure that the voltage measured is +13.5V DC +/- 500mV.